EP2583383A1 - Digital distributed antenna system with improved data transmission features - Google Patents
Digital distributed antenna system with improved data transmission featuresInfo
- Publication number
- EP2583383A1 EP2583383A1 EP11728987.6A EP11728987A EP2583383A1 EP 2583383 A1 EP2583383 A1 EP 2583383A1 EP 11728987 A EP11728987 A EP 11728987A EP 2583383 A1 EP2583383 A1 EP 2583383A1
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- European Patent Office
- Prior art keywords
- signals
- digital
- circuitry
- signal
- digital signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 238000001914 filtration Methods 0.000 claims description 11
- 230000008054 signal transmission Effects 0.000 claims description 7
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- 230000006837 decompression Effects 0.000 description 21
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
Definitions
- DAS distributed antenna systems
- Antenna units and antennas are distributed through a building and are optimally placed to provide ubiquitous coverage inside the building or other areas.
- Digital distributed antenna systems often consist of one or more master units (MU) that are connected to various base transceiver stations (BTS) of various cellular providers employing different air interfaces.
- a series of physically separated remote antenna units (RAUs) are each connected to an MU via a digital serial link.
- the MU down converts and digitizes (ADC) the Downlink (DL) signals from the base station(s) and time division multiplexes (TDM) the digital data into frames that are then transmitted over appropriate serial data links to the RAUs.
- the RAUs digital-to- analog convert (DAC) the digital data and up convert the respective analog signals to the required RF format for transmission to fixed or mobile subscribers in the system.
- the RAUs down-convert and digitize Uplink (UL) signals from the fixed/mobile users and transmit the digitized data back to the ML).
- the ML) digital-to- analog may convert the signals from the mobile/fixed subscribers and up-convert them to the appropriate RF format for transmission to the various BTSs or the ML) may forward the digital data directly.
- the digital serial link between the ML) and RAUs can present a traffic bottleneck for a Digital DAS system.
- the data rate on the digital serial link is often limited to around 10Gbps due to the cost and the physical media that is used (e.g. optical fiber or twisted pair cable) for the serial link.
- one solution is to implement multiple digital serial links arranged in parallel to transmit the digitized RF data between the ML) and RAUs.
- using multiple digital serial links is expensive and can significantly increase installation costs for wideband systems.
- the ability to upgrade or add additional parallel serial links to existing legacy DAS installations may not be available, or may be prohibitively expensive.
- MIMO Multiple-Input Multiple-Output
- Such MIMO systems incorporate multiple signals from the base stations, as well as multiple antennas, such as at the RAUs that are utilized within a MIMO system. Those multiple and individual MIMO signals must be handled over the serial link of a digital DAS
- FIG. 1 is a block diagram of a distributed antenna system (DAS) for a single input single output SISO system.
- DAS distributed antenna system
- FIG. 2 is a block diagram of a distributed antenna system (DAS) for a multiple input multiple output MIMO system.
- DAS distributed antenna system
- Figure 3 is a block diagram of a DAS system for handling MIMO signals, showing the endpoints of the DAS system.
- Figure 4A is a block diagram off of a DAS endpoint for an embodiment of the invention.
- Figure 4B is a block diagram of another DAS endpoint for the embodiment of the invention illustrated in Figure 4A
- Figure 5 is as signal diagram of a correlation signal peak.
- Figure 6 is a timing diagram for serial data transmission in accordance with one embodiment of the invention.
- FIG. 7 is s block diagram of a DAS system for one embodiment of the invention.
- Figures 8A and 8B are block diagrams of endpoints of a DAS system in accordance with another embodiment of the invention.
- FIGS 9A and 9B are block diagrams of endpoints of a DAS system in accordance with another embodiment of the invention. Description Of The Invention
- MIMO Multiple- In put Multiple-Output
- the ML and the RAUs handle multiple MIMO signal streams that often offer improved performance over conventional Single-Input Single-Output (SISO) systems.
- Figure 1 shows a typical DAS system deployment for a SISO configuration.
- the DAS system handles traffic between one or more base stations 12, and user equipment 14.
- a base station such as base station 12, communicates over a wired link 15, or over a wireless link 1 6, with the DAS system 10 that incorporates one or more master units 18, a plurality of remote antenna units, and a digital serial link 22 for remote antenna units 20.
- the serial link may be any suitable serial link for handling digital traffic, including a copper link, such as coaxial cable or twisted pair cable, or a fiber link, such as a suitable fiber-optic cable.
- Multiple logical links may be combined onto a serial link 22, and the serial link could be uni-directional or bi-directional.
- a logical link may be associated with a MIMO stream, a diversity stream, a band stream, or a base station stream, wherein the streams represent digital representations of RF signals.
- the master units 1 8 and remote antenna units 20 are considered the "endpoint" of the DAS system and interface with the desired downlink traffic from the base station 12 to the user equipment 14 is handled in one direction by the DAS system 10, and is uplink traffic from the user equipment 14 to the base station 12 is handled in the other direction.
- This type of deployment is common for standards including and prior to 3G without antenna diversity.
- a DAS system 1 0a uses multiple antennas at each endpoint that are spaced about 1 ⁇ 2 a wavelength apart or greater at either the ML) or the RAU.
- Figure 2 shows a typical DAS system deployment for 4 x 4 MIMO configurations. While a 4 x 4 MIMO configuration is illustrated in Figure 2, other MIMO
- a suitable base station 12a provides the multiple MIMO signals, which might be handled through multiple antennas in the wireless link 16, or through individual MIMO signals handled by the wired link 15.
- the MIMO DAS system 10a
- MIMO signals are transported through the serial links 22 to/from the remote antenna units 20a, and the signals are broadcast to the user equipment 14 through a plurality of antennas 24 at the remote antenna units 20a.
- the user equipment 14 must also implement multiple antennas (not shown).
- the RF MIMO signals such as from each antenna, are digitized and transported separately on the serial link.
- the separate MIMO signals such as those signals received at the multiple antennas of the DAS system 1 0a, should be de-correlated from each other.
- the MIMO signals received on the multiple antennas used by either the ML) 18a or the RAU 20a there is usually some correlation between the MIMO signals received on the multiple antennas used by either the ML) 18a or the RAU 20a.
- the correlation is typically due to the layout and/or impact of the environment (e.g., indoor and/or outdoor environments) within which the DAS endpoints (MU, RAU) are configured and installed.
- the redundancy (i.e. correlation) of the received individual MIMO signals is exploited in such a way as to reduce the amount of data that is transported over the serial link in accordance with the invention.
- Various data compression mechanisms are used to compare the multiple MIMO receive signals and create new received signals such that uncorrelated data is handled without significant duplication of correlated data.
- the uncorrelated data is then sent over the serial data link. Any correlation between the multiple MIMO received signals is sent only once, as one of the MIMO signals and the correlated data is removed from the other signals. This effectively reduces the bandwidth requirements on the serial link. There are various ways of implementing this data compression, as discussed herein.
- the inventive methods used have minimal delay so as not to affect the overall system performance of the MIMO system.
- Figure 3 illustrates how signals in a MIMO system are conventionally transmitted.
- Figure 3 illustrates that the A/D conversion of the signal received at two antennas, such as at an ML) 18a, may be converted from analog to digital, transmitted to time-division multiplexing circuitry, TDM module, then sent via digital serial link to the other end, such as an RAU 20a.
- TDM module time-division multiplexing circuitry
- RAU 20a digital serial link to the other end
- the correlation of the individual MIMO signals received by the individual antennas can be exploited to compress the data to the TDM circuitry, and thus reduce the data to transmit between the RAU and the MU on the serial link.
- a determination is made with respect to the correlation between the multiple MIMO signal streams for more efficiently handling data in the DAS system.
- a 2 x 2 MIMO system is illustrated, for example.
- the front end circuitry 40 for an endpoint of such a MIMO system is illustrated.
- the front end circuitry 40 might be incorporated within an endpoint, such as a master unit or some other component.
- That endpoint 40 is connected by a serial data link 42 to appropriate back end circuitry 44 at another endpoint, such as a remote antenna unit (See Figure 4B).
- a serial data link 42 to appropriate back end circuitry 44 at another endpoint, such as a remote antenna unit (See Figure 4B).
- DL downlink
- UL uplink
- the embodiment incorporates correlation between the multiple MIMO signal streams to determine if the MIMO signal data sent on the serial link may be reduced, and replaced with other data. More specifically, based upon times of significant correlation in the MIMO signals, it may only be desirable to send some subset of the MIMO signals on the serial data link 42. In a 2 x 2 MIMO system, for example, it may be desirable to send only one of the original MIMO signal streams when correlation is high. The normal time slots associated with the other MIMO signal stream might then be populated with "other" data.
- the front end circuitry 40 might incorporate a direct digital l/Q link to a base station or a remote radio head, which provides the MIMO signals r1 , r2.
- the front end circuitry 40 may incorporate suitable uplink/downlink antennas 46 or a direct analog RF link 48 to a base station, as indicated by circuitry block 50. With an RF link, a signal is then downconverted by appropriate frequency conversion circuitry 52 and digitally-converted to a digital signal from analog with adequate signal processing circuitry 54 that may include digital downconversion, decimation, and filtering.
- the Ml MO signals r1 and r2 are then further processed by the front end circuitry 40 of the DAS endpoint, in accordance with the invention. Both streams r1 and r2 are directed to processing circuitry 56 controlled by a suitable processing controller 58 for conditioning the signals.
- the processing circuitry 56 combined with the processing controller 57, may include a configurable bandwidth filter, an adaptive filter, or more complex processing stage.
- the invention evaluates similarities between the signals and forms a similarity value or some other indication of the similarity of the signals that is compare against a threshold. In one embodiment of the invention, correlation it utilized for determining the similarity between the signals r1 , r2. In alternative embodiments, other methods are used for evaluating and determining signal similarities.
- the main purpose of the processing circuitry 56 is to condition the individual data streams r1 , r2 for optimal compression, pursuant to the invention.
- the processing circuitry 56 is configured to scale the signal streams r1 , r2 in both amplitude and phase.
- the signal streams are scaled toward each other for achieving a maximum correlation peak, when correlation exists between r1 and r2.
- the processed signal streams r1 - _p and r2_p are directed to correlation circuitry 60 where the signal streams are received as input, and a given sample size is correlated periodically.
- the correlation circuitry 60 might also be controlled by processing controller circuitry 58 via control lines 61 .
- the sample size may be varied to maximize the instances in which the signal streams correlate well.
- Delay circuits 62 are implemented in the various paths to adapt to any delay invoked by the correlation circuitry 60. To that end, the delay introduced by the delay circuitry 62 might be varied. [
- the correlation value that is output from the correlation circuitry 60 is directed to threshold detector circuitry 64.
- the threshold detector circuitry 64 determines whether the correlation between the signal streams r1 , r2 is strong, and particularly compares the correlation signal peak to a threshold to determine whether the correlation exceeds the threshold.
- correlation signal indicated as 66 may have a peak 68 when the correlation between the signal streams r1 , r2 is strong. If a peak 68 exceeds a threshold 70, the invention will send only a subset of the multiple signal streams over the serial link. Specifically, referring to Figure 4A, if the threshold detector indicates a correlation peak 68 that exceeds the threshold 70, then the second signal stream r2 is interrupted, such as by switch circuitry 72.
- the switch circuitry 72 may be controlled by a control signal 71 from the threshold detector circuitry. Therefore, the signal stream r2 is not transmitted over the serial link 42. Instead, the second signal stream r2 is interrupted, a flag or flag information is set, as shown by output 74 from the threshold detector, and other non-MIMO data is then multiplexed onto the serial link in the time slots that would have occupied by the second MIMO signal stream r2 if the correlation had been below the threshold.
- a flag condition 74 is input to a switch controller 76 for controlling switch 86 for the introduction of additional data (i.e., non- r2 data) to the multiplexer circuitry 80 for time-division multiplexing the additional data onto the serial link 42.
- Additional data 82 might be directed through a FIFO memory block 84.
- Data flow controller circuitry 77 appropriately controls memory block 84 for multiplexing other data 82 onto the multiplexer 80 and the serial link 42.
- the FIFO memory block 84 can be utilized to buffer the additional data 82 at the time when no free slots are available on the combined serial data stream.
- the data flow controller circuitry 77 is appropriately configured to provide an override mechanism, such as through the threshold detector circuitry 64, to control switch 77 and interrupt the second stream signal r2 and allow the other data to be sent instead.
- the data flow controller circuitry 77, controller 76, threshold detector circuitry 64, and switching circuitry 72, 86 manage when to send the second stream r2 (low correlation), and when to send other data (high correlation or some other conditions).
- FIG. 6 a time slot for sending other data to replace the r2 signal stream is illustrated.
- the stream sent on the serial link 42 will have suitable slots for the r1 signals and r2 signals.
- the other data is slotted into the empty r2 slots.
- the signal streams r1 and r2 may be parallel samples, but also alternatively, might be serial samples as well.
- the processing controller 58 provides processing coefficients and settings, pursuant to the processing of the signals, such as indicated by line 90. When the processed signal r1 is sent, the processing coefficients/settings 90 are then communicated and multiplexed onto the combined serial data stream by the multiplexer circuitry 80 along with the flag information 74.
- the signal r1 might be sent unprocessed.
- a switch 59 might be implemented to provide the unprocessed r1 signal to the delay block 62, rather than the processed signal r1 .
- Switch 59 may be appropriately controlled depending upon the version of the signal r1 to be sent.
- the back end circuitry 44 at anther DAS endpoint, recovers the original signals from the combined serial data stream on digital data link 42.
- Back end circuitry 44 might be implemented, for example, in a remote antenna unit.
- the combined serial data stream is directed by link 42 into suitable TDM demultiplexer circuitry 92.
- the control flag information 74 is detected, and used to control how the second signal stream r2' is derived.
- the flag information 74 is directed to controller circuitry 94 that may be utilized to control switching circuitry 96 for directing the signal paths to the suitable processing circuitry 98, or to a receiver 100 when the combined serial data stream includes "other" data than just the MIMO signal streams.
- controller 94 controls the switch circuitry 96 so that the second signal stream r2' is derived from the first signal stream r1 .
- the signal path for the r1 signal is directed to the processing circuitry 98 for both paths.
- the combined serial data stream on link 42 also includes the processing coefficients and settings 90 that are directed by the de-multiplexing circuitry 92 to processing controller circuitry 102.
- the first and second signal streams are then processed by the suitable processing circuitry 98 to invert the processing that occurred in the front end circuitry, as illustrated in Figure 4A.
- the processing controller 102 receives the processing coefficients and processing settings via the combined serial data and sets the coefficients for each of the processing circuitry blocks 98.
- the output of each of the processing blocks r1 ' and r2' will be as close as possible to the original Ml MO signal streams r1 and r2.
- the processing circuitry 98 might include an adaptive filter that employs minimization of error algorithms, such as least mean square (LMS) or recursive least squares (RLS), or other signal processing techniques.
- LMS least mean square
- RLS recursive least squares
- the flag information 74 will indicate that other data was sent in the combined serial data stream.
- the switch circuitry 96 that directs the r1 signal to be used to construct the r2' signal will also direct the de-multiplexed other data from circuitry 92 to the receiver 100, where it is further processed. That is, the output path from de-multiplexer circuitry 92 normally used for the second signal r2 is directed to the receiver 100 for processing the other data that is in the slots reserved for the r2 signal.
- the r1 and r2 signals are both sent over the serial link.
- the switches 59 are set so that processed versions of signals r1 , r2 are sent. In such a case, processing settings may be sent as well.
- unprocessed versions of r1 , r2 are sent on the serial link. The separate r1 , r2 signals are handled separately and are directed through the respective paths to be further transmitted. If processed versions of r1 , r2 are sent, they will be processed individually by the processing circuitry 98.
- the processing circuitry 98 will pass those signals generally unmodified.
- the signals might be directed as digital signals to suitable digital signal processing circuitry (not shown).
- the signals might be converted to RF and further transmitted, such as over a wireless interface.
- optional circuitry on the back end transmission side might include D/A circuitry 104 to convert the digital signals to analog signals, provide any digital upconversion, digital interpolation, and/or filtering.
- frequency conversion circuitry 106 may be utilized to upconvert the signal to a suitable RF frequency where they may then be transmitted through multiple MIMO antennas 1 1 0.
- processing controller 58 in the processing circuitry 56 may determine an error signal or difference signal between the processed signals r1 and r2.
- the level of the error or difference signal indicates the similarity between the signals r1 and r2.
- processing controller 58 might be coupled directly with the threshold detector circuitry 64, such as by control lines 63.
- the processing controller 58 would provide the error signal which may be used for creating a difference value for comparison to a particular threshold by the threshold detector circuitry.
- the flag 74 is set and only one of the signals, such as r1 , is sent along with other data 82, as discussed hereinabove. If the difference value exceeds a threshold level indicating significantly different signals r1 , r2, the flag is not set. As such, processing steps for determining the similarities of the signals might include other processing rather than just correlation processing.
- Figure 7 illustrates an alternative embodiment of the invention and illustrates a signal path in a DAS system that implements subtraction of at least part of a first MIMO signal r1 from a second MIMO signal r2, to compress that modified signal prior to transmission to the TDM multiplexer circuit to time-division multiplex the signal onto a serial data link.
- the signal path of Figure 7 may be indicative of a downlink path from a DAS master unit to a remote antenna unit or an uplink path from the remote antenna unit to a master unit.
- the received MIMO signals r1 and r2 such as a signal received by an appropriate link like antenna 1 10, are frequency downconverted by circuitry 1 12 and converted to digital signals by A/D circuitry 1 14.
- signal r1 is subtracted from received MIMO signal r2.
- CFR Crest Factor Reduction
- CFR CFR circuitry 1 18, and in particular CFR circuitry that utilizes "graceful" clipping, can be used to reduce the nonlinearity effects of a hard limiter. In this manner, the benefits of MIMO may be achieved without sending the redundant information down the serial link 122, thus reducing the serial data.
- circuitry as illustrated in Figure 7 might only be implemented after it is determined that the signals are highly correlated, as discussed with respect to Figures 4A, 4B. Figure 7 does not illustrate the circuitry for determining correlation.
- the reduced serial link is then received by suitable TDM demultiplexing circuitry 124, wherein the signals are then separated to reconstruct the Ml MO signals r1 and r2.
- the difference signal that was transmitted is added to the original MIMO signal r1 by appropriate circuitry 126 to reconstruct the signals r1 and r2.
- the digital signals may then be converted to analog signals by appropriate circuitry 128, and then upconverted to a suitable RF signal by a frequency conversion circuitry 130, and then transmitted by suitable antennas 132.
- the resulting signals might also be processed or transmitted in another fashion.
- FIGS 8A and 8B illustrate a further alternative embodiment of the invention utilizing data reduction for one or more correlated MIMO signals for the purposes of reducing a serial data rate on a serial link between endpoints in a digital distributed antenna system.
- MIMO signals might be received by front end circuitry 140, such as RF signals that are captured by suitable antennas 142. The signals might then be downconverted by appropriate frequency conversion circuitry 144, and then converted to digital signal r1 and r2, as illustrated.
- the signals might be delivered directly to the front end circuitry 140 as digital signals.
- the digital signals r1 , r2, and specifically the combined serial data stream might be reduced utilizing adaptive filtering and signal subtraction, as illustrated in Figure 8A.
- the received MIMO signal r1 is directed to an adaptive filter 146.
- Adaptive filter 146 may be an adaptive LMS filter, for example.
- the filtered r1 signal 147 is then subtracted by suitable circuitry 148 from the other received MIMO signal r2.
- the resulting compressed signal 150 is used as feedback to the adaptive filter 146 for adaptation.
- the resulting signal indicated as Rcmp (n) is a compressed signal, as indicated by Equation 1 :
- Adaptive filter 146 utilizing the feedback signal Rcmp(n) will adjust its filter coefficients in order to try to minimize the resulting Rcmp(n) signal.
- the compressed signal Rcmp(n), as well as the original MIMO signal r1 and the filter coefficients 156 of the adaptive filter 146, are then directed to suitable TDM multiplexing circuitry 152, and are multiplexed into a combined signal to be sent on serial data link 154.
- the compressed signal Rcmp(n) requires fewer bits to transmit than the original MIMO signal r2 due to the smaller amplitude of Rcmp(n).
- the filter coefficients 156 from the adaptive filter 146 are relatively slow changing, and thus, can be updated at a somewhat slow rate through the serial data link 154, and the multiplexing circuitry 152.
- FIG. 8B illustrates back end circuitry 160 coupled with the front end circuitry 140 by the serial data link 154.
- back end circuitry will be in a DAS endpoint component.
- a configurable filter 162 is coupled to receive the original MIMO signal r1 , as well as the filter coefficients 156 from the multiplexing circuitry 164.
- the configurable filter 162 processes the MIMO signal r1 with the filter coefficients 156, and the resulting signal 163 is added to the compressed signal Rcmp(n) in order to recreate the original MIMO signal r1 .
- the resulting digital signals can then be converted back to analog signals and otherwise transmitted over a wireless or wired medium from the DAS system to other components, whether that is a base station or user equipment.
- FIGS 9A and 9B illustrate further embodiments of the invention illustrating the signal path between endpoints of a digital DAS system using compression to improve data flow through.
- digital MIMO signal r1 and r2 are delivered to front end circuitry 170 for further processing in accordance with aspects of the invention.
- the signal compression exploits the similarities or correlation between multiple MIMO streams, such as the two MIMO streams r1 and r2, in order to reduce the amount of data sent over a combined serial data stream in a suitable serial link.
- Each of the digital signals r1 and r2 is delivered to suitable processing circuitry 172. That processing circuitry may incorporate a fixed bandwidth filter, and an adaptive filter, or more complex processing stage.
- the signals r1 , r2 may be digital signals, or might be captured as analog signals or RF signals by endpoint front end circuitry 50, such as antenna 46 or direct links 48 to a BTS, and further processed as necessary to be presented as digital signals.
- the processing circuitry 1 72 is controlled by processing controller circuitry 174.
- the primary purpose of the processing circuitry 172 is to condition the individual data streams r1 and r2 for optimal compressing. For example, the amplitude and phase of the signals might be scaled in order to scale the signal streams toward each other to achieve a maximum correlation peak.
- the processing controller circuitry 174 also provides output processing coefficients and settings 1 75 to compression manager circuitry 180.
- Figures 9A and 9B illustrate several compression schemes and circuits which may be utilized in achieving the invention. While the different compression schemes and their circuitry components are discussed herein with respect to Figures 9A and 9B, it is not necessary that all such compression schemes be implemented together. Rather, each of the noted compression schemes might be implemented individually, according to the invention. Also, one or more of the compression schemes might be implemented together with another compression scheme.
- one or more of the signal streams r1 and r2 may be compressed individually.
- compression circuitry 176 positioned in each signal path will receive the r1 and r2 data streams.
- the compression circuitry 176 is coupled to suitable compression manager circuitry that contains the necessary processing circuitry for controlling the compression schemes and compression circuitry.
- the compression manager circuitry provides one or more control signals 177 to the compression circuitry 176.
- the compression manager circuitry 180 verifies the amount of compression that is achieved for the various data streams r1 or r2.
- the compression manager circuitry 180 also selects the most efficient compression scheme that might be used if there are multiple compression schemes available.
- the compression manager circuitry 180 controls and optimizes the compression algorithm used for each scheme, such as utilized in the compression circuitry 176.
- the outputs of the compression circuitry 176 for each of the data streams r1 and r2 are fed to the compression manager circuitry 180.
- the output 182 of the compression manager circuitry is then the serial data of compressed and combined signals for the various MIMO signal paths.
- the serial data output is fed into TDM multiplexer circuitry 184.
- the compression manager circuitry also outputs compression settings that are combined with the processing coefficients and settings and are also fed to the multiplexing circuitry 184 to be combined over the serial link 186 as a combined serial data stream.
- data flow controller circuitry 190 may be suitably and operably coupled with the compression manager circuitry 180 to manage the compression controller circuitry, and also to manage and adjust the amount of "other" data that might be combined under the combined serial data stream, such as through the FIFO memory element 192 or other buffer, as illustrated in Figure 9A. Additional data may be placed into available slots, as discussed above with respect to the other embodiments.
- the combined serial data stream on serial data link 186 is then directed to the other endpoint of the path, and must be recovered and decompressed back to the original MIMO signals r1 and r2 for further processing.
- back end circuitry 200 is illustrated at a DAS endpoint for decompressing and recovering the signal streams r1 and r2.
- the suitable decompression scheme must be implemented on the back end, and thus, decompression circuitry components are coupled in the signal paths for providing such decompression.
- the serial data link 186 is directed to suitable TDM de-multiplexer circuitry 202.
- the de-multiplexing circuitry 202 may separate out any "other" data that was sent over the serial link in the combined serial data stream.
- the MIMO signal data is then directed on separate signal paths for decompression.
- path 204 will contain the multiplexed serial compressed data
- path 206 contains the processing coefficients and settings and compression settings provided from the front end circuitry 1 70.
- Those signals are directed to decompression manager circuitry 208.
- the decompression manager circuitry provides compression settings 207 as appropriate to the decompression circuitry and controls the individual decompression circuitry in a way that
- Decompression manager circuitry 208 will control each of the decompression circuitry components, depending upon the compression settings and other parameters provided by the compression manager circuitry 1 80.
- the decompression manager circuitry 208 directs the serial compressed data to decompression circuits 210, along with the necessary compression settings 207 in order to provide the desired decompression of the data.
- Decompressed data is then directed to suitable processing circuitry 212 that is controlled by processing controller circuitry 214 utilizing the processing coefficients and settings that were provided by the front end circuitry in the combined serial data streams.
- decompression manager circuitry 208 outputs the suitable processing coefficients and settings 216 that are implemented by the processing controller for controlling processing circuitry 212 to again provide the decompressed and reconstructed signals r1 ' and r2'.
- Suitable feedback signals 218 are also provided to the processing controller 214 as necessary for processing.
- the MIMO signals r1 ' and r2' may be forwarded further along the path and transmitted, or otherwise proposed, as desired at the endpoint of the DAS system.
- they may be provided by a wired or wireless link, such as to a base station or to a user equipment, depending upon whether the signal path of Figures 9A and 9B is implemented in the uplink or the downlink direction.
- Suitable circuitry 51 might be used with the backend circuitry 200 for further signal transmission.
- the decompression manager circuitry 208 is configured to introduce suitable delays in the signals to equalize the potentially different delays that the signals will experience in each decompression scheme.
- the processing stage provided by circuits 212 and 214 will follow any of the decompression stages to essentially invert the processing that occurred in the front end circuitry 1 70.
- compression circuitry 230 and an interlace circuitry 232.
- the signal streams r1 and r2 are directed to the interlace circuitry 232.
- the interlaced stream 233 is then provided to compression circuitry 230, both under the control of the compression manager 1 80. That combined and compressed signal is then directed to the compression manager and output to the multiplexer circuitry 184, along with the various processing and compression settings.
- Compression optimization through circuitry 230 is provided by the compression manager circuitry through appropriate control lines 177.
- the combined serial data stream is then provided to the back end circuitry 200 over serial data link 186.
- the interlaced signal is then provided through appropriate decompression circuitry 236, and de-interlace circuitry 238 for again separating the signals into separate paths.
- the signals r1 ' and r2' are presented for further transmission in the DAS system.
- Figures 9A and 9B disclose another alternative compression scheme.
- circuitry 240 provides delta encoding and compression in which the difference between the two signal streams r1 and r2 is encoded and then compressed.
- the compression manager circuitry 180 will verify the amount of compression achieved, and select the most efficient compression scheme through appropriate control signals 242.
- the compressed signal is then provided through the compression manager circuitry 182, multiplexing circuitry 184, and delivered to the back end circuitry 200, as illustrated in Figure 9B.
- signal 244 is directed to circuitry 246 for delta decoding and decompressing the signal. After that decompression, through further processing in the processing circuitry 21 2, the decompressed and reconstructed MIMO signals r1 ' and r2' are delivered for further transmission in the DAS system.
- Embodiments of the invention are not limited to MIMO applications.
- the invention would provide benefits for diversity systems as well.
- Embodiments of the invention thus, use mechanisms that provide compression of the digitized signals in a way that reduces the required serial link data rate between the endpoints, like the ML) and the RAUs in a DAS system.
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Abstract
Description
Claims
Priority Applications (1)
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EP17198890.0A EP3297177A1 (en) | 2010-06-18 | 2011-06-20 | Digital distributed antenna system with improved data transmission features |
Applications Claiming Priority (2)
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US35609710P | 2010-06-18 | 2010-06-18 | |
PCT/US2011/041076 WO2011160117A1 (en) | 2010-06-18 | 2011-06-20 | Digital distributed antenna system with improved data transmission features |
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EP17198890.0A Division EP3297177A1 (en) | 2010-06-18 | 2011-06-20 | Digital distributed antenna system with improved data transmission features |
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EP2583383A1 true EP2583383A1 (en) | 2013-04-24 |
EP2583383B1 EP2583383B1 (en) | 2017-11-15 |
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EP17198890.0A Withdrawn EP3297177A1 (en) | 2010-06-18 | 2011-06-20 | Digital distributed antenna system with improved data transmission features |
EP11728987.6A Active EP2583383B1 (en) | 2010-06-18 | 2011-06-20 | Digital distributed antenna system with improved data transmission features |
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EP17198890.0A Withdrawn EP3297177A1 (en) | 2010-06-18 | 2011-06-20 | Digital distributed antenna system with improved data transmission features |
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US (3) | US9014256B2 (en) |
EP (2) | EP3297177A1 (en) |
CN (1) | CN103155434B (en) |
WO (1) | WO2011160117A1 (en) |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1403065B1 (en) | 2010-12-01 | 2013-10-04 | Andrew Wireless Systems Gmbh | DISTRIBUTED ANTENNA SYSTEM FOR MIMO SIGNALS. |
WO2009053910A2 (en) | 2007-10-22 | 2009-04-30 | Mobileaccess Networks Ltd. | Communication system using low bandwidth wires |
WO2010090999A1 (en) | 2009-02-03 | 2010-08-12 | Corning Cable Systems Llc | Optical fiber-based distributed antenna systems, components, and related methods for monitoring and configuring thereof |
US8280259B2 (en) | 2009-11-13 | 2012-10-02 | Corning Cable Systems Llc | Radio-over-fiber (RoF) system for protocol-independent wired and/or wireless communication |
IT1398025B1 (en) | 2010-02-12 | 2013-02-07 | Andrew Llc | DISTRIBUTED ANTENNA SYSTEM FOR MIMO COMMUNICATIONS. |
US8275265B2 (en) | 2010-02-15 | 2012-09-25 | Corning Cable Systems Llc | Dynamic cell bonding (DCB) for radio-over-fiber (RoF)-based networks and communication systems and related methods |
US9525488B2 (en) | 2010-05-02 | 2016-12-20 | Corning Optical Communications LLC | Digital data services and/or power distribution in optical fiber-based distributed communications systems providing digital data and radio frequency (RF) communications services, and related components and methods |
WO2011160117A1 (en) | 2010-06-18 | 2011-12-22 | Andrew Llc | Digital distributed antenna system with improved data transmission features |
US8594223B2 (en) | 2010-06-18 | 2013-11-26 | Andrew Llc | Transport data reduction for DAS systems |
CN103119865A (en) | 2010-08-16 | 2013-05-22 | 康宁光缆系统有限责任公司 | Remote antenna clusters and related systems, components, and methods supporting digital data signal propagation between remote antenna units |
KR102163548B1 (en) * | 2010-10-01 | 2020-10-12 | 콤스코프 테크놀로지스, 엘엘씨 | Distributed antenna system for MIMO signals |
US9252874B2 (en) | 2010-10-13 | 2016-02-02 | Ccs Technology, Inc | Power management for remote antenna units in distributed antenna systems |
WO2012115843A1 (en) | 2011-02-21 | 2012-08-30 | Corning Cable Systems Llc | Providing digital data services as electrical signals and radio-frequency (rf) communications over optical fiber in distributed communications systems, and related components and methods |
CN103609146B (en) | 2011-04-29 | 2017-05-31 | 康宁光缆系统有限责任公司 | For increasing the radio frequency in distributing antenna system(RF)The system of power, method and apparatus |
WO2013142662A2 (en) | 2012-03-23 | 2013-09-26 | Corning Mobile Access Ltd. | Radio-frequency integrated circuit (rfic) chip(s) for providing distributed antenna system functionalities, and related components, systems, and methods |
EP2832012A1 (en) | 2012-03-30 | 2015-02-04 | Corning Optical Communications LLC | Reducing location-dependent interference in distributed antenna systems operating in multiple-input, multiple-output (mimo) configuration, and related components, systems, and methods |
US9455784B2 (en) | 2012-10-31 | 2016-09-27 | Corning Optical Communications Wireless Ltd | Deployable wireless infrastructures and methods of deploying wireless infrastructures |
CN105308876B (en) | 2012-11-29 | 2018-06-22 | 康宁光电通信有限责任公司 | Remote unit antennas in distributing antenna system combines |
EP3064032A1 (en) * | 2013-10-28 | 2016-09-07 | Corning Optical Communications Wireless Ltd | Unified optical fiber-based distributed antenna systems (dass) for supporting small cell communications deployment from multiple small cell service providers, and related devices and methods |
US9847816B2 (en) | 2013-12-19 | 2017-12-19 | Dali Systems Co. Ltd. | Digital transport of data over distributed antenna network |
WO2015126828A1 (en) * | 2014-02-18 | 2015-08-27 | Commscope Technologiees Llc | Selectively combining uplink signals in distributed antenna systems |
US9775123B2 (en) | 2014-03-28 | 2017-09-26 | Corning Optical Communications Wireless Ltd. | Individualized gain control of uplink paths in remote units in a distributed antenna system (DAS) based on individual remote unit contribution to combined uplink power |
US9525472B2 (en) | 2014-07-30 | 2016-12-20 | Corning Incorporated | Reducing location-dependent destructive interference in distributed antenna systems (DASS) operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods |
US9730228B2 (en) | 2014-08-29 | 2017-08-08 | Corning Optical Communications Wireless Ltd | Individualized gain control of remote uplink band paths in a remote unit in a distributed antenna system (DAS), based on combined uplink power level in the remote unit |
US9184960B1 (en) | 2014-09-25 | 2015-11-10 | Corning Optical Communications Wireless Ltd | Frequency shifting a communications signal(s) in a multi-frequency distributed antenna system (DAS) to avoid or reduce frequency interference |
US9420542B2 (en) | 2014-09-25 | 2016-08-16 | Corning Optical Communications Wireless Ltd | System-wide uplink band gain control in a distributed antenna system (DAS), based on per band gain control of remote uplink paths in remote units |
US10659163B2 (en) | 2014-09-25 | 2020-05-19 | Corning Optical Communications LLC | Supporting analog remote antenna units (RAUs) in digital distributed antenna systems (DASs) using analog RAU digital adaptors |
WO2016071902A1 (en) | 2014-11-03 | 2016-05-12 | Corning Optical Communications Wireless Ltd. | Multi-band monopole planar antennas configured to facilitate improved radio frequency (rf) isolation in multiple-input multiple-output (mimo) antenna arrangement |
WO2016075696A1 (en) | 2014-11-13 | 2016-05-19 | Corning Optical Communications Wireless Ltd. | Analog distributed antenna systems (dass) supporting distribution of digital communications signals interfaced from a digital signal source and analog radio frequency (rf) communications signals |
US9729267B2 (en) | 2014-12-11 | 2017-08-08 | Corning Optical Communications Wireless Ltd | Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting |
WO2016098111A1 (en) | 2014-12-18 | 2016-06-23 | Corning Optical Communications Wireless Ltd. | Digital- analog interface modules (da!ms) for flexibly.distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (dass) |
EP3235336A1 (en) | 2014-12-18 | 2017-10-25 | Corning Optical Communications Wireless Ltd. | Digital interface modules (dims) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (dass) |
WO2016108651A1 (en) * | 2014-12-30 | 2016-07-07 | 주식회사 쏠리드 | Cfr arranging method in distributed antenna system |
US10693527B2 (en) | 2014-12-30 | 2020-06-23 | Solid, Inc. | Distributed antenna system including crest factor reduction module disposed at optimum position |
CN107211429B (en) * | 2015-02-05 | 2021-05-28 | 康普技术有限责任公司 | System and method for emulating uplink diversity signals |
WO2016176249A1 (en) | 2015-04-27 | 2016-11-03 | Commscope Technologies Llc | Transport of modulated radio communication signals over data networks |
WO2019135733A1 (en) * | 2018-01-02 | 2019-07-11 | Intel Corporation | LOW POWER mmWAVE RECEIVER ARCHITECTURE WITH SPATIAL COMPRESSION INTERFACE |
Family Cites Families (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61126836A (en) * | 1984-11-22 | 1986-06-14 | Sansui Electric Co | System and apparatus of pcm transmission |
US5434948A (en) * | 1989-06-15 | 1995-07-18 | British Telecommunications Public Limited Company | Polyphonic coding |
US5642463A (en) * | 1992-12-21 | 1997-06-24 | Sharp Kabushiki Kaisha | Stereophonic voice recording and playback device |
US6054896A (en) * | 1998-12-17 | 2000-04-25 | Datum Telegraphic Inc. | Controller and associated methods for a linc linear power amplifier |
US6330458B1 (en) * | 1998-08-31 | 2001-12-11 | Lucent Technologies Inc. | Intelligent antenna sub-sector switching for time slotted systems |
US8225370B2 (en) * | 2000-07-13 | 2012-07-17 | Sony Corporation | Digital broadcast signal processing apparatus and digital broadcast signal processing method |
US6785341B2 (en) | 2001-05-11 | 2004-08-31 | Qualcomm Incorporated | Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information |
JP3393127B2 (en) | 2001-07-09 | 2003-04-07 | 沖電気工業株式会社 | Communication terminal device and data transmission method thereof |
JP3649326B2 (en) | 2001-11-13 | 2005-05-18 | 日本電気株式会社 | OFDM guard interval length control method and OFDM transmitter / receiver |
US7035671B2 (en) | 2002-04-08 | 2006-04-25 | Adc Telecommunications, Inc. | Method and apparatus for intelligent noise reduction in a distributed communication system |
US7103377B2 (en) | 2002-12-03 | 2006-09-05 | Adc Telecommunications, Inc. | Small signal threshold and proportional gain distributed digital communications |
US8958789B2 (en) * | 2002-12-03 | 2015-02-17 | Adc Telecommunications, Inc. | Distributed digital antenna system |
US7469491B2 (en) * | 2004-01-27 | 2008-12-30 | Crestcom, Inc. | Transmitter predistortion circuit and method therefor |
US7394410B1 (en) * | 2004-02-13 | 2008-07-01 | Samplify Systems, Inc. | Enhanced data converters using compression and decompression |
US7009533B1 (en) | 2004-02-13 | 2006-03-07 | Samplify Systems Llc | Adaptive compression and decompression of bandlimited signals |
US7974359B2 (en) * | 2004-12-22 | 2011-07-05 | Qualcomm Incorporated | Methods and apparatus for mitigating multi-antenna correlation effect in communication systems |
US8023457B2 (en) | 2006-10-02 | 2011-09-20 | Freescale Semiconductor, Inc. | Feedback reduction for MIMO precoded system by exploiting channel correlation |
WO2009021359A1 (en) * | 2007-08-14 | 2009-02-19 | Alcatel Shanghai Bell Co., Ltd. | Cell management set, distributed antennae system and reassignment method thereof |
US7974244B2 (en) | 2007-08-21 | 2011-07-05 | Adc Telecommunications, Inc. | Method and system for reducing uplink noise in wireless communication systems |
US20090075644A1 (en) | 2007-09-19 | 2009-03-19 | Adc Telecommunications, Inc. | System and method for selectively rejecting frequency bands in wireless communication systems |
JP2009077188A (en) | 2007-09-21 | 2009-04-09 | Hitachi Ltd | Semiconductor device |
US20100254489A1 (en) * | 2007-11-14 | 2010-10-07 | Thomson Licensing | Code enhanced staggercasting |
US8005152B2 (en) * | 2008-05-21 | 2011-08-23 | Samplify Systems, Inc. | Compression of baseband signals in base transceiver systems |
US8174428B2 (en) | 2008-05-21 | 2012-05-08 | Integrated Device Technology, Inc. | Compression of signals in base transceiver systems |
US8630673B2 (en) * | 2009-03-03 | 2014-01-14 | Qualcomm, Incorporated | Method and system for reducing feedback information in multicarrier-based communication systems based on frequency grouping |
US9148889B2 (en) * | 2009-06-01 | 2015-09-29 | Qualcomm Incorporated | Control of multiple radios using a database of interference-related information |
US20110113762A1 (en) | 2009-11-16 | 2011-05-19 | Airflow Catalyst Systems | Use Of Powder Coated Nickel Foam As A Resistor To Increase The Temperature of Catalytic Converter Devices With The Use Of Electricity |
WO2011145377A1 (en) * | 2010-05-17 | 2011-11-24 | コニカミノルタエムジー株式会社 | Radiographic-image processing device |
US8594223B2 (en) | 2010-06-18 | 2013-11-26 | Andrew Llc | Transport data reduction for DAS systems |
WO2011160117A1 (en) | 2010-06-18 | 2011-12-22 | Andrew Llc | Digital distributed antenna system with improved data transmission features |
-
2011
- 2011-06-20 WO PCT/US2011/041076 patent/WO2011160117A1/en active Application Filing
- 2011-06-20 CN CN201180037371.1A patent/CN103155434B/en active Active
- 2011-06-20 EP EP17198890.0A patent/EP3297177A1/en not_active Withdrawn
- 2011-06-20 EP EP11728987.6A patent/EP2583383B1/en active Active
-
2013
- 2013-11-22 US US14/087,805 patent/US9014256B2/en active Active
-
2015
- 2015-04-01 US US14/676,325 patent/US9800369B2/en active Active
-
2017
- 2017-10-23 US US15/791,208 patent/US10742348B2/en active Active
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2011160117A1 * |
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CN103155434A (en) | 2013-06-12 |
US20180109351A1 (en) | 2018-04-19 |
US20140079112A1 (en) | 2014-03-20 |
US10742348B2 (en) | 2020-08-11 |
US9800369B2 (en) | 2017-10-24 |
US9014256B2 (en) | 2015-04-21 |
EP3297177A1 (en) | 2018-03-21 |
WO2011160117A1 (en) | 2011-12-22 |
US20150207589A1 (en) | 2015-07-23 |
EP2583383B1 (en) | 2017-11-15 |
CN103155434B (en) | 2016-08-24 |
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